1. The radius of a regular decagon is 6m. What is the length of its apothem?
2. The area of a triangle with sides of length 10 in. and 17 in. and an included angle of 113° is equal to the area of a regular heptagon. Determine the length of each side of the heptagon.
3. Determine the area of the waste material in cutting out the largest circle (diameter is 23 cm) from a regular decagon.
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